These puzzles originate from Japan and have been known under a number of names such as Japanese puzzles, Descartes enigma and Nonograms, which was the original title of the Sunday Telegraoh ones. The idea is to fill in a grid correctly so that a picture appears. You are told how may squares in each row and column need to be filled in but not the exact position. You need to use skill and logic to determine the position of the squares that are to be filled in and those that are blank. It takes a while to get into and I wouldn't recommend this book to beginners. There are four earlier Nonogram books from the same source which contain smaller puzzles and are an ideal starting point for anyone wishing to get into these puzzles.

There are a couple of minus points. Firstly, if you make a mistake, it is not always apparent until much later by which time you will have erroneously filled in several more squares incorrectly based on your mistake.

Secondly, all the puzzles have been previously published in the Sunday Telegraph. There are no new ones However, unlike crosswords, they can be equally enjoyed second time around.